Turbo-generator ventilation



July 28, 1931. J. A. KuYsER 1,816,489

TURBO GENERATOR VENTILATION v Filed Deo. 5. 1929 of z 1 mvENToR fsf 44.wz/Tyaff.

Patented July 28, 1931 UNiTED STATES PATENT OFFICE .TAN .ARTHUR KUYSER,OF SALE, ENGLAND, ASSIGNOR TO XVESTINGI-IOUSE ELECTRIC & MANUFACTURINGCOMPANY, A CORPORATION OF PENNSYLVANIA TURBO-GENERATOR VENTILATIONApplication filed December 5, 1929, Serial No. 411,818, and in GreatBritain December 6, 1928.

My invention relates to the ventilation of turbo-generators which havean extremely great length and a very limited cross-sectional area of airgap, so that it becomes necessary to introduce cooling air throughannular intake chambers surrounding the middle portions of the statormembers, from which it is conducted inwardly through radial Ventilatingducts provided for the purpose in the stator member.

My invention relates to novel means for providing an auxiliary system ofventilation to supplement that which usually is provided by means oit'fans disposed on the ends oil the rotor member.

Referring to the accompanying drawings,

Fig. 1 is a central longitudinal sectional view of a turbo-generatorVentilating system embodying my invention, the section plane beingindicated by the line I-I in Fig, 3, and

Figs. 2 and 3 are transversesectional views taken on the planesindicated by the dotted lines II-II and III- Ill of Fig. 1,respectively.

As shown in the drawings, my invention is preferably applied to aturbo-generator comprising a stator member 11 and a rotor member 12separated by an air gap 13. The stator and rotor members are bothpreferably provided with radial Ventilating ducts 16 and 17,respectively, and the stator member is surrounded by a plurality ofannular chambers which are alternately outlet and inlet chambers, twoinlet chambers being shown at 19 and 20, and three outlet chambers beingindicated at 21, 22 and 23.

The machine is completely enclosed in a frame 24 having a doubleend-bell construction, the inner endv bell 26 having its inner peripheryterminating close to a an 28 which is provided at each end of the rotormember.

The machine is mounted on a foundation consisting of a Ventilatingcasing 3() for providing a closed ventilation system. The air from theannular discharge chambers 21, 22 and 23 of the machine is leddownwardly into an exhaust chamber 33 within the foundation casing 30.From this exhaust chamber, the air passes through a suitable cooler 34into the main body of the foundation casing 30, which thus constitutesan intake chamber or the machine, from which the air passes upwardlyinto the spaces between the double end bells at each end of the machine,as indicated by the arrows. The air then passes through the rotor fans28 and is delivered to the spaces within the inner end bells, from whichit flows partially into the ends of the air gap and partially into aplurality of ducts 36 which conduct it from the end-bell spaces to theseveral annular intake chambers 19 and 20 surrounding the stator member.

According to my present invention, auxiliary Ventilating means areprovided, in parallel, so to speak, with the rotor ans 2S, so that aseparate supply of air, other than that which flows through the ducts 36con necting with the end-bell spaces, is supplied to the annular intakechamber or chambers 19 and 2O surrounding the stator member. By way oi?illustration, I have shown two independent means -for furnishing twoindel pendent supplies of air for the two annular intake chambers 1S)and 20. rlhus, in 'the bottom ot the exhaust chamber 33, as indicated inFig. 2, two motors 41 and 42 are shown, driving fans 43 and 13a whichreceive cooled air from the general body of thei'oundation chamber, asthrough the intake ducts Llei, and deliver it into two horizontalchannels 45 and 4:6, respectively. 'lhere are also provided two verticalair ducts i7 and 48 which are both connected, at their bottom ends, toboth of the channels l5 and 46 which are connected to the delivery sidesof the Jfans 13 and 43a. The vertical ducts are in communication, at

their top ends, with the annular intake chambers 19 and 20,respectively, of the stator member. At the bottoms of the two verticalducts 47 and '18 just mentioned, I have provided dampers t9 which may beswung over to close oif the communication with either of the fans 43 and43a.

Normally, each fan il?) or Se delivers air to only one of the verticalducts 47 and 4S. lVhen, however, one ot the fans is shut down, as, forinstance, the fan a3, which normally supplies air to the vertical duct47, the damper 49 in that duct is moved to shut oil` its communicationwith the shut-down tan and to place it in communication with theremaining fan rl-3a, indicated by dotted lines in F ig. 3. lVhen both ofthe fans i3 and 43e are shut down, the annular intake chambers l9`and 2Oot the stator member receives their air solely from the ducts 36 leadingto the end-bell spaces, as previously described.

`While l have described and illustrated a single preferred form ofembodiment of my invention, it will be obvious that l am by no meanslimited thereto, as one of the essential features of the invention is toprovide an auxiliary source oi cooling air for the annular intakechamber or chambers surrounding the stator member, and, when dampermeans are utilized, it is obvious that any damping means having theeffect ot' closing or opening the auxiliary intake ducts ot the machineor of placing them in coinmunication with each other in order to besupplied by a single tan, may be adopted without departing from theessential spirit and scope of my invention. I desire, theretore, thatthe appended claims be given the broadest scope consistent with theirlan guage and the prior art.

I claim as my invention:

1. A ventilation system for a dynamoelectric machine having a pluralityof ventilating ducts, said lsystem comprising at least two external fanseach normally supplying Ventilating fluid to its own special group ofducts, and means for putting either Ytan into or out of operationindependently during the operation of the machine, characterized bymeans whereby, when one or more oi. said fans is or are renderedinactive, the remainder which remain operativel may be caused tocirculate air through the Ventilating ducts appertaining to suchinactive tan or fans.

2. A ventilation system according to claim l, characterized by having arotor lian upon each end of the rotor, means for providing an air-intakechamber, and means communieating with said air-intake chamber fordelivering said air into ducts adjacent to the intake sides of saidrotor fans and further characterized by the `fact that the twoindependently operating fans are disposed to pass air from an intakechamber to annular intake chambers around portions of the stator memberintermediate the ends, said external fans having damper means associated therewith whereby, when one or both of said independentlyoperable fans is or are rendered inactive, the ducts pertaining theretomay be included in circuit with the fans which remain operative.

In testimony whereof, l hereunto subscribe my name this 11th day ofNovember, 1929. JAN ARTHUR KUYSER.

